Question

what is diff btw preprocessor directive and compiler

Answer 1

Answer:

Preprocessor directives, are typically used to make source programs easy to change and easy to compile in different execution environments. Directives in the source file tell the preprocessor to take specific actions. ... Preprocessor lines are recognized and carried out before macro expansion.

In computer science, a preprocessor (or a precompiler) is a program that processes its input data to produce output that is used as input to another program. The output is said to be a preprocessed form of the input data, which is often used by some subsequent programs like compilers

Explanation:

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